Just go to 1. bugs.webkit.org 2. login with username and pasword 3. logout 4. revisit bugs.webkit.org 5. input username ---> The password is not filled out automagically!
See <http://trac.webkit.org/projects/webkit/wiki/Known%20incompatibilities%20between%20open-source%20WebKit%20and%20Safari>. *** This bug has been marked as a duplicate of 6877 ***